Network Analyzer - Channel 2 not working.

[michaelvv]

Hi Digilent.

I'm totally new to the analog discovery , so yesterday I tried the "audio analyzer suite" and I saw that my channel 2 seems to be "not working".

Just now I fired up waveforms, and tried the network analyzer , and it seems to have the same issue.

When I tried the wavegen and the scope I have no problems.

I have attached 3 images , the should show the issues.

I have also attached the project file I'm using.

Thanks Michael.

 

network_settings_digilent.dwf3network

[attila]

Hi @michaelvv

According the Scope screenshot the Channel 2 is working, only the polarity is inverted relative to Channel 1.
Make sure you have the scope input polarity 1/2 +/- connected correctly.

In the Network Analyzer it looks like Channel 2 is connected to a different signal or you have very effective bandpass filter at 1kHz.

The setup for such measurement should look like this:

Wavegen = W1; Scope 1 = 1+; Scope 2 = 2+; 1- and 2- GND

Could you post a photo or sketch about the wiring and test setup?

[michaelvv]

Hi Attila.

I might be a complete idiot, but I have just wired it using the BNC add-on card directly.

My goal is to be able to use the "audio analyzer suite" and of course waveforms.

Thanks Michael.

 

[michaelvv]

Hi Attila.

I saw the video on youtube from blueglow electronics https://www.youtube.com/watch?time_continue=885&v=1rOvdsxQVTY

and I could see that he is using the channel 1 with a T-Adapter so it feeds both left and right channel to ( input on the amp ) from only channel 1.

Could it be the issue ???

 

[attila]

Yes, you need one stimulus signal.

https://projects.digilentinc.com/brandon-marcum/using-the-network-analyzer-with-the-analog-discovery-2-88f698